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          RunLoop的一些场景
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        <h2 id="一、autoreleasePool-在何时被释放？"><a href="#一、autoreleasePool-在何时被释放？" class="headerlink" title="一、autoreleasePool 在何时被释放？"></a>一、<code>autoreleasePool</code> 在何时被释放？</h2><p><code>App</code>启动后，苹果在主线程 <code>RunLoop</code> 里注册了两个 <code>Observer</code>，其回调都是 <code>_wrapRunLoopWithAutoreleasePoolHandler()</code>。</p>
<p>第一个 <code>Observer</code> 监视的事件是 <code>Entry(即将进入Loop)</code>，其回调内会调用 <code>_objc_autoreleasePoolPush()</code> 创建自动释放池。其 <code>order</code> 是 <code>-2147483647</code>，优先级最高，保证创建释放池发生在其他所有回调之前。</p>
<p>第二个 <code>Observer</code> 监视了两个事件： <code>BeforeWaiting</code>(准备进入休眠) 时调用<code>_objc_autoreleasePoolPop()</code>  和 <code>_objc_autoreleasePoolPush()</code> 释放旧的池并创建新池；<code>Exit</code>(即将退出Loop) 时调用 <code>_objc_autoreleasePoolPop()</code> 来释放自动释放池。这个 <code>Observer</code> 的 <code>order</code> 是 <code>2147483647</code>，优先级最低，保证其释放池子发生在其他所有回调之后。</p>
<p>在主线程执行的代码，通常是写在诸如事件回调、<code>Timer</code>回调内的。这些回调会被 <code>RunLoop</code> 创建好的 <code>AutoreleasePool</code> 环绕着，所以不会出现内存泄漏，开发者也不必显示创建 <code>Pool</code> 了。</p>
<h2 id="二、PerformSelector-的实现原理？"><a href="#二、PerformSelector-的实现原理？" class="headerlink" title="二、PerformSelector 的实现原理？"></a>二、<code>PerformSelector</code> 的实现原理？</h2><p>当调用 NSObject 的 performSelecter:afterDelay: 后，实际上其内部会创建一个 Timer 并添加到当前线程的 RunLoop 中。所以如果当前线程没有 RunLoop，则这个方法会失效。</p>
<p>当调用 performSelector:onThread: 时，实际上其会创建一个 Timer 加到对应的线程去，同样的，如果对应线程没有 RunLoop 该方法也会失效。</p>
<h2 id="三、PerformSelector-afterDelay-这个方法在子线程中是否起作用？为什么？怎么解决？"><a href="#三、PerformSelector-afterDelay-这个方法在子线程中是否起作用？为什么？怎么解决？" class="headerlink" title="三、PerformSelector:afterDelay:这个方法在子线程中是否起作用？为什么？怎么解决？"></a>三、<code>PerformSelector:afterDelay:</code>这个方法在子线程中是否起作用？为什么？怎么解决？</h2><p>不起作用，子线程默认没有 <code>Runloop</code>，也就没有 <code>Timer</code>。</p>
<p>解决的办法是可以使用 <code>GCD</code> 来实现：<code>Dispatch_after</code></p>
<h2 id="四、为什么-NSTimer-有时候不好使？"><a href="#四、为什么-NSTimer-有时候不好使？" class="headerlink" title="四、为什么 NSTimer 有时候不好使？"></a>四、为什么 <code>NSTimer</code> 有时候不好使？</h2><p>因为创建的  <code>NSTimer</code> 默认是被加入到了 <code>defaultMode</code>，所以当 <code>Runloop</code> 的 <code>Mode</code> 变化时，当前的 <code>NSTimer</code> 就不会工作了。</p>
<h2 id="五、解释一下-GCD-在-Runloop-中的使用？"><a href="#五、解释一下-GCD-在-Runloop-中的使用？" class="headerlink" title="五、解释一下 GCD 在 Runloop 中的使用？"></a>五、解释一下 <code>GCD</code> 在 <code>Runloop</code> 中的使用？</h2><p><code>GCD</code>由 子线程 返回到 主线程,只有在这种情况下才会触发 RunLoop。会触发 RunLoop 的 Source 1 事件。</p>
<h2 id="六、解释一下-NSTimer。"><a href="#六、解释一下-NSTimer。" class="headerlink" title="六、解释一下 NSTimer。"></a>六、解释一下 <code>NSTimer</code>。</h2><p><code>NSTimer</code> 其实就是 <code>CFRunLoopTimerRef</code>，他们之间是 <code>toll-free bridged</code> 的。一个 <code>NSTimer</code> 注册到 <code>RunLoop</code> 后，<code>RunLoop</code> 会为其重复的时间点注册好事件。例如 <code>10:00</code>, <code>10:10</code>, <code>10:20</code> 这几个时间点。<code>RunLoop</code> 为了节省资源，并不会在非常准确的时间点回调这个<code>Timer</code>。<code>Timer</code> 有个属性叫做 <code>Tolerance</code> (宽容度)，标示了当时间点到后，容许有多少最大误差。</p>
<p>如果某个时间点被错过了，例如执行了一个很长的任务，则那个时间点的回调也会跳过去，不会延后执行。就比如等公交，如果 10:10 时我忙着玩手机错过了那个点的公交，那我只能等 10:20 这一趟了。</p>
<p><code>CADisplayLink</code> 是一个和屏幕刷新率一致的定时器（但实际实现原理更复杂，和 NSTimer 并不一样，其内部实际是操作了一个 <code>Source</code>）。如果在两次屏幕刷新之间执行了一个长任务，那其中就会有一帧被跳过去（和 <code>NSTimer</code> 相似），造成界面卡顿的感觉。在快速滑动 <code>TableView</code> 时，即使一帧的卡顿也会让用户有所察觉。<code>Facebook</code> 开源的 <code>AsyncDisplayLink</code> 就是为了解决界面卡顿的问题，其内部也用到了 <code>RunLoop</code>。</p>
<h2 id="七、等待补充中。。。"><a href="#七、等待补充中。。。" class="headerlink" title="七、等待补充中。。。"></a>七、等待补充中。。。</h2>
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